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Property, Plant and Equipment, Net - Schedule of Property, Plant and Equipment, Net (Detail) - USD ($)
$ in Millions
Sep. 30, 2016
Jun. 30, 2016
Property, Plant and Equipment [Abstract]    
Land $ 2.3 $ 2.3
Buildings and improvements 17.4 17.3
Leasehold improvements 20.0 18.7
Equipment 103.6 103.4
Gross property, plant and equipment 143.3 141.7
Less accumulated depreciation (86.5) (83.4)
Property, plant and equipment, net $ 56.8 $ 58.3